Variable Sized Cellular Remnants in the Nail Plate of Longitudinal Melanonychia: Evidence of Subungual Melanoma

328 Ann Dermatol Received April 24, 2014, Revised June 20, 2014, Accepted for publication June 25, 2014 Corresponding author: Dong-Youn Lee, Department of Dermatology, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul 135-710, Korea. Tel: 82-2-34103543, Fax: 82-2-3410-3869, E-mail: [email protected] This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http:// creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. thermal and photomechanical reactions. It may be considered that QSNL has a higher risk of PIH, and that long-pulse lasers are more suitable for darker skin types. However, more purpura developed with the long-pulse Nd:YAG technique, and the increased risk of scar formation is a main concern in long-pulse laser treatment. In this study, we have confirmed the effectiveness and adverse effects of QSNL in the treatment of lentigines, both on the basis of physicians’ and patients’ subjective assessment, and by using the more objective colorimeter evaluation method.